Lock



C. HOFFMAN.

LOCK.

APPLICATION FILED JULY I6, 1920.

1,383,631. Patented July 5,1921.

2 SHEETS-SHEET I.

Ca/ wwwo.

C. HOFFMAN.

LOCK.

APPLICATION FILED JULY 16, 1920.

1,383,631. Patented July 5,1921.

2 SHEETS-SHEET 2- 60/6 IVo/flzaaza CARL HOFFMAN, OF ALLENTOVJN, PENNSYLVANIA.

LOCK.

Application filed July 16,

T 0 all 10 1 mm it may concern Be it known that I, CARL HOFFMAN, of Allentown, in the county of Lehigh and State of Pennsylvania, iave invented certain new and useful Improvements in Locks; and T do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. 7

My invention relates to looks of the type wherein latching and locking bolts are con tained in a singlecase, and I have shown the lock of the form adapted to be mortised in a door. The object of my invention is to produce a simple and highly efiicient lock of the character described with all parts com-- pactly arranged and one wherein the latch member is operable by means of a door handle and is also adapted to be retracted by the bit of a key from out-side the door, the key being used to first withdraw the locking bolt, if it has been thrown into locking-position; wherein an auxiliary locking bolt is employed which is only operable from inside the door, and the movement of which into locking position causes a shield or guard to be placed overthe key hole so that a key or other instrument cannot be inserted into the look from the outside; and wherein frictionally operated stops. are employed for renderin the parts inoperative.

in the drawings, Figure l is a view in perspective. Fig. 2 is an elevation of a portion of a door equipped with my improved mortise lock. 3 shows a lock with one of its casing plates removed. Fig. l is a longitudinal. sectional view. Fig. 5 is a perspective view of the latch and operating lever. lie. 6 is a perspective view of the locking bolt and one of the tumblers. Figs. 7 and 8 are details showing the latch stop and locking button respectively.

Referring to the drawings, the mortise lock shown includes a casing 1 which is of common form having openings for the pro jection of the latch and locking members and for the handles to operate the latch, as well as key holes. At 2 I have indicated the latch having a beveled face with a rib for lessening the noise of contact with the keeper plate in the door frame. The latch has re esses 35 of similar formation and located on opposite sides of the latch shank so Specification of Letters Patent.

Patent-enemy a, rear.

1920. Serial No. 396,694. I J

that the latch may be reversed according to the direction in which the dooropens, the recesses being for the upper end of an operating lever 4%. which is oft-shape and arranged for pivotalmovement on the locking bolt 5. The end 6 of thelever is bent at right angles to the face of the lever so as i to present a widened surface to control lugs 7 and 8, respectively operated byinnerand outer handles 9 and 10. The lug 7 is shorter than its complementary lug and is dependent from a hub 12 supported for turning movement by a wall of the case and bythe hub 13 from which depends the lug 8, the contacting surfaces of the hubs having a supporting fit each with theothen andthe hub 13 on its outer side being .journaled in the opposite wall ofthe casing. These hubs. have each a square opening tore'ceive the squared end of its respective handle. Turning of either hub and the engagement between its lug and the end of the lever will effect a rocking of the latter on its pivot on the locking bolt, and a retraction of the latch against its spring tension.

Movementof the locking bolt 5 is effected from the outside by means of a key which must first disengage one or more tumblers 20 before the talons 21 or 22 of the bolt can be engaged by-the key. The tumblers are of known form wherein, a leaf spring 23 engaging the tumbler and fixed stud 24: on the. case tensions the tumbler to maintain it in locking engagement with the bolt so as to prevent movement or" the latter. As a matter of economy I make use of one of the springs 23 for maintaining the latch in eX- tended position as well as functioning inits normal manner with the tumbler. When the bolt 5 is protracted it carries with it the operatiimlever 4- and in this position the end 6 of the lever is beyond a point where either of the depending lugs 7 or 8 can rock the lever on its pivot. In retracting the bolt by means of a key the tumblers'are first moved and the talons of the bolt are then engageable by the key. When com pletely retracted a continued turning of the key in the same direction will cause its bit to engage the adjacent edge of the lever 4, rocking the lever and thus withdrawing the latch. I

Manifestly a means must be employed for use on the inside of the door whichwill permit the locking bolt to be protracted and retracted without the use oi? a key and for this purpose I use the latch operating lug 7. The hub 12 carrying this lug may be turned by the inside handle so as to engage talons 30, 31. at the inner end of the looking bolt, the lug 7 in this turning movement first engaging the tumblers 20 so as to release them from locking engagement with the bolt. Atter retracting the bolt continued turning of the handle in the same direction will cause the lug to engage the end 6 of the latch controlling lever and move it to retract the latch.

Manipulation of the locking bolt by the outside handle is prevented by the formation of the lug 8. This lug is of greater length than its companion lug 7 and turning movement in a counterclockwise direction, which would be necessary to project the lock bolt by the outside handle is prevented by contact of the lug 8 with a stop pin 35 permanently secured to the case. Movement of the lug in a direction to withdraw the lock bolt is prevented by engagement of the lug with the latch operating lever and since the lever has been bodily moved outwardly with the lock bolt and is in close proximity to that wall of the casing through which the looking members project it is in a position where it cannot be rocked by the lug and the latter cannot reach the lock bolt because the end 6 of the lever is in the path of turning movement of the lug. The lug 8 may be fastened against any movement by a stop button 36 frictionally supported adjacent the handle 9, the shank of the button extending through the case and being adapted for projection into an aperture 37 in the lug 8.

In addition to the locking elements heretofore described I provide an auxiliary bolt 40 which is retained in inner or outer position by a spring held tumbler 41, the tumbler being moved by the bit 4-2 of a fixed key just prior to engagement of the bit with the appropriate talon oi? the bolt. This auX- iliary bolt carries a shieldl3, which, when the bolt is in looking position, completely covers the key hole and prevents insertion of a key or other tool from the outside.

The latch 2 may be secured against movement by a locking dog 44 trictionally held bolt is in retracted position, and means for preventing operation of the latch and locking bolts from one side of said case.

2. A, lock including a case, spring held latchbolt, a tumbler controlled lock bolt designed for key actuation, a latchbolt operlever carried by said locking bolt, lugs operable to engage a portion of said lever to retract said latchbolt, one oi? said lugs being operable from inside the door and the other from outside the, door, the inside operable lug being effective to move said lock bolt, and means for rendering said outside operable lug inoperative.

3. A look including a case, a spring held latchbolt, a tumbler controlled lock bolt designed for key actuation, a latchbolt operating lever carried by said locking bolt, lugs operable to engage a portion of said lever to retract said 'latchbolt, one of said lugs being effective to move said lock bolt, said lever having a second contact surface designed to be engaged by the lock-bolt operating-key to withdraw the latchbolt when the locking bolt is in retracted position, and means for preventing movement of one of said lugs to manipulate said latchbolt from one side of said case.

4. A look including a case, a spring held latchbolt, a tumbler controlled lock bolt designed for key actuation, a latchbolt operating lever carried by said locking bolt, lugs supported "for turning movement in said case and designed to engage a portion of said lever to retract said latchbolt, one of said lugs being effective to move said look bolt, inner and outer handles each cooperating with a lug to turn it, and means for rendering said outer handle ineffective to manipulate its complementary lug.

5. A lock including a case, a spring held latchbolt, a tumbler controlled lock bolt designed for key actuation, a latchbolt operatlever carried by said locking bolt, lugs independently operable to engage a portion of said lever to retract saidlatrh-bolt, a hub for each lug supported in alinement by said case, inner and outer handles each cooperating with a hub to turn it and its lug, and means engaging one of said lugs to prevent movement thereof.

6. A look including a case, a spring held latchbolt, a tumbler controlled lock bolt designed for key operation, a latchbolt'operating lever pivotally mounted on said locking bolt and adapted for operation by the lock bolt operating key, lugs supported for turning movement in said case and designed to enga a portion of said lever to retract said latch-bolt, one of said lugs being effective to move said lock bolt, inner and outer handles each cooperating with a lug to turn it, and means for preventing operation of the latch and locking bolts from one side of said case.

7. lock including a case, a spring held latchbolt, a tumbler controlled lock bolt designed for key operation, a latchbolt operating lever pivotally mounted on said locking bolt and adapted for operation by the lock bolt operatin' key, lugs supported for turning movement in said case and designed to engage a portion of said lever to retract said latch-bolt, one of said lugs being effective to move said lock bolt, inner and outer handles each cooperating With a lug to turn it, and means for preventing operation of the latch and locking bolts from one side of said case, comprising an auxiliary bolt having a guard to close the key hole when the auxiliary bolt is protracted to prevent access to said bolt, and a button operated stud engaging the lug operable by said outer handle to prevent turning.

In testimony whereof I have signed this specification.

' CARL HOFFMAN. 

